Performance of adaptive admission/congestion control policies on a hybrid MC-CDMA/TDMA integrated multimedia networks

by Baroudi, Uthman A.

Abstract (Summary)

Performance of Adaptive Admission/Congesrion Control Policies on a Hybrid
&
IC-CD
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f-A/TD htegrated Multimedia xenvorkç
Uthman A. Baroudi, Ph.D.
Concordia Cniversity: 2000
Future 3G CDMX networks are expected to have the ability co accommodate
wriety of users, each with its own transmission characteristics and quality of ser-
vice (QoS) requirements to be maintained. Compatible multi-access system should
provide the means to control (Le. admission/congestion) the flow of traffic and ar.
the same time main-i;ainthe QoS requirements
The essence of this work is to introduce an interac~ion
between the physicaI
layer and higher network layers, thus enabling more practical utilization of multi-user
detecrion and suppor~ing
services with different QoS parameeers. The rraffic sources
are classified accordhg to their activities and QoS of parameters into tmo categories,
namely stream and interactive traffic. As congestion aises, the interactive craffic
users are granted higher priority than the stream traffic users. In this work: a new
hybrid 'ilulticode (MC)-CDMA/TDMA medium access control technique utilizing
multi-user detection accompanied with a traffic flow control scheme is proposed and
analyzed.
Secondly, the End-to-lkd performance criteria of the proposed MAC such as
packet delay, channel utilization, etc. are investigated under new Window Measuremenc-
Based admission/congestion control policy where the status of the buffer at the base
station is estimated taking into consideration the physical limitations of the base
station (Le. the number of transmission and reception modems), cal1 and burst level
ixa.£Eic, channel impairment, etc.
Thirdly, the hybrid analysis/simulation routine is repeated to investigate and
wri-i the performance of the above proposed LIAC dong with several versions
of congesr;ion policies. The whole ?stem is studied under wïde range of r;r&c
load, and diEerenrr sysrern paramecers. The results show char; the QoS requirements
have been effectively main~ained
and rhe proposed syszern is amenable to practical
irnplernencàcion.